I used to have this nice editor plugin, that was highlighting all the visible occurrences of a specific word when I just pressed "Alt" having a cursor on it.
It was also drawing a crossed lines while pressed ctrl+shift (so I could easily find the cursor).
The plugin was called CRest: http://plugring.farmanager.com/plugin.php?pid=311&l=en

Unfortunately this plugin does not seem to be quite compatible with the recent version of Far, to which I switched some time ago because it has some other great features...

But the highlight word function was very useful for me and I really miss it, so do you maybe know any other way to have such a functionality with the recent Far3?